1019
Q:

A student multiplied a number by 3/5 instead of 5/3, What is the percentage error in the calculation ?

A) 54 % B) 64 %
C) 74 % D) 84 %

Answer:   B) 64 %



Explanation:

Let the number be x.

Then, ideally he should have multiplied by  x by 5/3. Hence Correct result was x * (5/3)= 5x/3. 

 

By mistake he multiplied x by 3/5 . Hence the result with error  = 3x/5 

Then, error = (5x/3 - 3x/5) = 16x/15 

Error %  = (error/True vaue) * 100 = [(16/15) * x/(5/3) * x] * 100 = 64 %

Q:

A number is decreased by 30%, then increased by 30%, then further increased by 30%. What is the net increase/decrease percent in the number (correct to the nearest integer)?

 

A) 19% decrease B) 19% increase
C) 18% increase D) 18% decrease
 
Answer & Explanation Answer: C) 18% increase

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1 170
Q:

A number is increased by 30%, then decreased by 30%, then further decreased by 30%. What is the net increase/decrease percent in the number(correct to the nearest integer)?

 

A) 36% decrease B) 36% increase
C) 40% increase D) 40% decrease
 
Answer & Explanation Answer: A) 36% decrease

Explanation:
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2 159
Q:

A man bought 2 articles for ₹4158 each. He sold one article at 15% loss. Then at what percent profit the other article should be sold so that no profit/loss percentage is earned.

 

A) 15% B) 10%
C) 12% D) 18%
 
Answer & Explanation Answer: A) 15%

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1 1006
Q:

Two students, A and B, appeared for an examination. A secured 8 marks more than B and the marks of the former was 55% of the sum of their marks. The marks obtained by A and B, respectively, are:

 

A) 44, 36 B) 40, 32
C) 36, 28 D) 38, 30
 
Answer & Explanation Answer: A) 44, 36

Explanation:
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6 536
Q:

If each side of a rectangle is increased by 22%, then its area will increase by:

 

A) 48.84% B) 50%
C) 44% D) 46.65%
 
Answer & Explanation Answer: A) 48.84%

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2 10402
Q:

Two students, A and B, appeared for an examination. A secured 8 marks more than B and the marks of the former was 55% of the sum of their marks. The sum of the marks obtained by A and B is:

 

A) 75 B) 100
C) 90 D) 80
 
Answer & Explanation Answer: D) 80

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2 407
Q:

The sum of salaries of A and B is ₹43000. A spends 95% of his salary and B spends 80% of his salary. If their savings are the same, what is A’s salary (in ₹)?

 

A) 8000 B) 34400
C) 10600 D) 35000
 
Answer & Explanation Answer: B) 34400

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2 2896
Q:

Two students, A and B, appeared for an examination. A secured 8 marks more than B and the marks of the former was 60% of the sum of their marks. The sum of the marks obtained by A and B is:

 

A) 75 B) 45
C) 40 D) 50
 
Answer & Explanation Answer: C) 40

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3 435